[Cf1_3c] smallest word (constructor)

Source: Internet
Author: User

Given a string composed of A and B, you can choose to flip or not flip each of its prefixes, flip as 1, not flip as 0, returns the operation sequence with the smallest lexicographically ordered string.

N <= 1e3

Idea: consider a very long segment A [T, w]

Flip the T-1 and W to move this section A to the front

` 1 #include<cstdio> 2 #include<cstring> 3 #include<string> 4 #include<cmath> 5 #include<iostream> 6 #include<algorithm> 7 #include<map> 8 #include<queue> 9 #include<vector>10 #include<ctime>11 using namespace std;12 typedef long long ll;13 typedef unsigned int uint;14 typedef unsigned long long ull;15 typedef pair<int,int> PII;16 typedef vector<int> VI;17 #define fi first18 #define se second 19 #define MP make_pair20 #define N  21000021 #define M  13022 #define MOD 100000000723 #define eps 1e-8 24 #define pi acos(-1)25 26 char a[N];27 int b[N],c[N];28 29 int main()30 {31     scanf("%s",a+1);32     int n=strlen(a+1);33     for(int i=1;i<=n;i++)34      if(a[i]==‘a‘) c[i]=0;35       else c[i]=1;36       37     int i=0;38     memset(b,0,sizeof(b));39     while(i<=n)40     {41         i++;42         if(c[i]==1||i>n) continue;43         int t=i;44         int w=i;45         while(i+1<=n&&c[i+1]==0){i++; w++;}46         b[t-1]^=1; b[w]^=1;47     }48     for(int i=1;i<=n-1;i++) printf("%d ",b[i]);49     printf("%d",b[n]);50     return 0;`

[Cf1_3c] smallest word (constructor)

Related Keywords:

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

• Sales Support

1 on 1 presale consultation

• After-Sales Support

24/7 Technical Support 6 Free Tickets per Quarter Faster Response

• Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.